周期外力对频率涨落的过阻尼谐振子所作的功和能量随机共振  

Work done by a periodical external force on an overdamped harmonic oscillator with frequency fluctuation and energetic stochastic resonance

作　　者：张良英[1] 曹力[1] 吴大进[1] 

机构地区：[1]湖北文理学院物理与电子工程学院,襄阳441053

出　　处：《物理学报》2013年第19期58-62,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11045004)资助的课题~~

摘　　要：研究了周期外力对频率涨落的过阻尼谐振子系统作功的特点.结果揭示了瞬时功率随时间的周期变化出现不对称性.研究结果还揭示周期外力一个周期对系统所做的功随乘法噪声强度的变化出现非单调行为,系统是否出现能量随机共振与抑制并存,由乘法噪声与加法噪声之间互关联的符号决定.Characterization of the work done by a periodic external force on an overdamped harmonic oscillator with frequency fluctuation is studied. Results indicate that the instantaneous power with periodic variations of time shows asymmetry. It is also revealed that the work done by a periodic external force on the system in one period with the variation of multiplicative noise intensity exhibits non-monotonic behavior. Whether the system shows the coexistence of energetic stochastic resonance and suppression or not is determined by the sign of the correlation coefficient between the multiplicative noise and the additive noise.

关 键 词：过阻尼谐振子 频率涨落 周期外力作功 能量随机共振与抑制 

分 类 号：O322[理学—一般力学与力学基础]